120th General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation of Young Analytical Chemists I
Room No. Room C311+C312
Time THU 10:17-:
Code ANAL1.O-29
Subject An investigation on the various internal standards for the accurate determination of the arsenic species in rice
Authors Seong Hun Son, WONBAE LEE, Sang-Ho Nam*
Department of Chemistry, Mokpo National University, Korea
Abstract Rice is a staple food in the world`s half population and is a major source of human arsenic intake. But, toxicity of arsenic depends on its chemical forms. Therefore, the selective and quantitative determination of the total arsenic as well as the arsenic species in rice has been very important. However, the extraction and determination of arsenic species in rice has been very difficult because of the severe matrix interference. In this study, the various analytical methods including the internal standard method and standard addition method have been investigated for the determination of arsenic species in rice. The extraction solvent has been used 0.28 M nitric acid. A new analytical method was developed for the determination of arsenic species in rice by inductively coupled plasma - mass spectrometry (ICP-MS) coupled with ion chromatography (IC). Rice certified reference material (NIST SRM 1568b rice flour) was used to evaluate its suitability for the analytical method. In this study, two internal standards were used. The first internal standard was injected before sample introduction to correct the signal change with time, and the second internal standard was spiked into the sample to remove or reduce the matrix interferences. Recoveries of inorganic arsenic, DMA, MMA, and total arsenic for the certified values were 92 %, 116 %, 107 % and 107 %, respectively, with the developed method.
E-mail vlzkcb3033@naver.com